<template>
  <view>
    <my-search @myClick="gotoSearch" ></my-search>
    
    <view class="scroll-view-container">
      <!-- 左侧 -->
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
        <block v-for="(item,index) in cateList" :key="index">
          <view :class="['left-scroll-view-item', index === active? 'active': '']" @click="activeChange(index)">{{item.cat_name}}</view>
        </block>                
      </scroll-view>
      
      <!-- 右侧 -->
      <scroll-view scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2, index2) in cateLevel2" :key="index2">
          <view class= "cate-lv2-title" >/ {{item2.cat_name}} /</view>
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3,index3) in item2.children" :key="index3" @click="gotoGoodsList(item3)" >
              <image :src="item3.cat_icon"></image>
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>              
      </scroll-view>
      
      
    </view>
  </view>
</template>

<script>
 import badgeMix from '@/mixins/tabbar-badge.js'
 
 export default {
   mixins: [badgeMix],
    data() {
      return {
        wh: 0,
        cateList: [],
        active: 0,
        cateLevel2: [],
        scrollTop: 0
      };
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight - 50
      this.getCateList()
    },
    methods: {
      async getCateList() {
       const {data: res} = await uni.$http.get('/api/public/v1/categories')
       if (res.meta.status !== 200) return uni.$showMsg()
       this.cateList = res.message
       this.cateLevel2 = res.message[0].children
      },
      activeChange(index) {
        this.active = index  
        this.cateLevel2 = this.cateList[index].children
        this.scrollTop = this.scrollTop === 0? 1: 0
      },
      gotoGoodsList(item) {
        uni.navigateTo({
          url: '/subPackages/goods_list/goods_list?cid=' + item.cat_id
        })
      },
      gotoSearch() {
        uni.navigateTo({
          url:'/subPackages/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;
    
    .left-scroll-view {
      width: 240rpx;
      
      .left-scroll-view-item {
        background-color: #F7F7F7;
        line-height: 60px;
        text-align: center;
        font-size: 12px;
        
        &.active {
          position: relative;
          background-color: #ffffff;
          
            &::before {
              display: block;
              position: absolute;
              top: 50%;
              transform: translateY(-50%);
              left: 0;
              content: '';
              width: 3px;
              height: 30px;
              background-color: #c00000;
            }
        }
      }
    }
  }
  
  .cate-lv2-title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }
  
  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;
    
    .cate-lv3-item {
      width: 33.33%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center; 
      margin-bottom: 10px;
      
      image {
        width: 60px;
        height: 60px;
      }
      text {
        font-size: 12px
      }
    }
  }
</style>
